calling a django view recursively - django

Question

I am trying to call a view recursively. Below is my code.
views.py
def survey_start(request):
post = models.Post.objects.all().order_by('id')
return HttpResponseRedirect(reverse('post_form_upload',args=(post[0].id,)))
def post_form_upload(request, id):
post = get_object_or_404(models.Post, id=id)
if request.method == 'GET':
content = post.content
form = CommentModelForm(content = content)
else:
form = CommentModelForm(request.POST)
if form.is_valid():
message = form.cleaned_data['message']
created_at = form.cleaned_data['created_at']
post1 = models.Comment.objects.create(post = id,
message = message,
created_at = created_at)
return HttpResponseRedirect(reverse('post_form_upload',
args= (post.next_id,)))
return render(request, 'survey_forms/post_form_upload.html',{
'form':form,
})
urls.py
urlpatterns = [
url(r'^post/form_upload.html$',views.survey_start, name='survey_start'),
url(r'^post/(?P<id>\d+)/post_form_upload.html$',views.post_form_upload, name='post_form_upload'),
]
I have two questions.
1. I keep on getting this error. It does enter the view. I printed a counter to check.
Reverse for 'post_form_upload' with arguments '()' and keyword arguments '{}' not found. 1 pattern(s) tried: ['survey_forms/post/(?P<id>\\d+)/post_form_upload.html$']
Here is the traceback:
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/survey_forms/post/1/post_form_upload.html
Django Version: 1.8.3
Python Version: 2.7.8
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'survey',
'dynamic_forms',
'crispy_forms',
'formtools',
'survey_forms')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.security.SecurityMiddleware',
'dynamic_forms.middlewares.FormModelMiddleware')
Template error:
In template /Users/Desktop/VtStudy/python/django/2dj_proto/mysurvey/survey_forms/templates/survey_forms/post_form_upload.html, error at line 1
Reverse for 'post_form_upload' with arguments '()' and keyword arguments '{}' not found. 1 pattern(s) tried: ['survey_forms/post/(?P<id>\\d+)/post_form_upload.html$']
1 : <form action=" {% url 'post_form_upload' %} " method='post'>
2 : {% csrf_token %}
3 :
4 : {{form.as_p}}
5 : <input type='submit' value='Submit'/>
6 : </form>
Traceback:
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site- packages/django/core/handlers/base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/Desktop/VtStudy/python/django/2dj_proto/mysurvey/survey_forms/views.py" in post_form_upload
132. 'form':form,
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site- packages/django/shortcuts.py" in render
67. template_name, context, request=request, using=using)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site- packages/django/template/loader.py" in render_to_string
99. return template.render(context, request)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-packages/django/template/backends/django.py" in render
74. return self.template.render(context)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site- packages/django/template/base.py" in render
209. return self._render(context)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site- packages/django/template/base.py" in _render
201. return self.nodelist.render(context)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-packages/django/template/base.py" in render
903. bit = self.render_node(node, context)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site- packages/django/template/debug.py" in render_node
79. return node.render(context)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site- packages/django/template/defaulttags.py" in render
507. six.reraise(*exc_info)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-packages/django/template/defaulttags.py" in render
493. url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site- packages/django/core/urlresolvers.py" in reverse
579. return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-packages/django/core/urlresolvers.py" in _reverse_with_prefix
496. (lookup_view_s, args, kwargs, len(patterns), patterns))
Exception Type: NoReverseMatch at /survey_forms/post/1/post_form_upload.html
Exception Value: Reverse for 'post_form_upload' with arguments '()' and keyword arguments '{}' not found. 1 pattern(s) tried: ['survey_forms/post/(? P<id>\\d+)/post_form_upload.html$']
Each post is displayed in one single page. The user must navigate from one page to other on clicking "next". So I am calling this view post_upload_form recursively. Is this the right approach?
Thanks.

Answer 1

For first point: problem is in the template:
<form action=" {% url 'post_form_upload' %} " method='post'>
post_form_upload in your urls.py takes one non-empty argument, but you're not providing that in above line.
For second point: this is not an recursion, technically speaking. You are just redirecting user to next url, which is handled by same view function. And it is right approach, there is nothing wrong with that.